Answer:
The correct option is 1.
Step-by-step explanation:
Given information: x║y, w is transversal line.
From the given figure it is clear that
[tex]\angle 2\cong \angle 3[/tex] (Definition of vertically opposite angles)
[tex]\angle 2\cong \angle 6[/tex] (Definition of corresponding angles)
According to the transitive property of congruent angles, if ∠1 ≅ ∠2 and ∠2 ≅ ∠3, then ∠1 ≅ ∠3.
Using transitive property of congruent angles, we get
[tex]\angle 3\cong \angle 6[/tex]
The missing reason is transitive property, therefore the correct option is 1.
